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**************************************************************************
Security Bulletin 9301 DISA Defense Communications System
January 14, 1993 Published by: DDN Security Coordination Center
(SCC@NIC.DDN.MIL) 1-(800) 365-3642
DEFENSE DATA NETWORK
SECURITY BULLETIN
The DDN SECURITY BULLETIN is distributed by the DDN SCC (Security
Coordination Center) under DISA contract as a means of communicating
information on network and host security exposures, fixes, and concerns
to security and management personnel at DDN facilities. Back issues may
be obtained via FTP (or Kermit) from NIC.DDN.MIL [192.112.36.5]
using login="anonymous" and password="guest". The bulletin pathname is
scc/ddn-security-yynn (where "yy" is the year the bulletin is issued
and "nn" is a bulletin number, e.g. scc/ddn-security-9301).
**************************************************************************
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! !
! The following important advisory was issued by the Computer !
! Emergency Response Team (CERT) and is being relayed unedited !
! via the Defense Information Systems Agency's Security !
! Coordination Center distribution system as a means of !
! providing DDN subscribers with useful security information. !
! !
+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - +
=============================================================================
CA-93:01 CERT Advisory
January 13, 1993
Revised Hewlett-Packard NIS ypbind Vulnerability
-----------------------------------------------------------------------------
*** THIS IS A REVISED CERT ADVISORY ***
*** IT CONTAINS NEW INFORMATION REGARDING AVAILABILITY OF IMAGE KITS ***
*** SUPERSEDES CERT ADVISORY CA-92:17 ***
The CERT Coordination Center has received information concerning a
vulnerability in the NIS ypbind module for the Hewlett-Packard (HP)
HP/UX Operating System for series 300, 700, and 800 computers.
HP has provided revised patches for all of the HP/UX level 8 releases
(8.0, 8.02, 8.06, and 8.07). This problem is fixed in HP/UX 9.0.
The following patches have been superseded:
Patch ID Replaced by Patch ID
PHNE_1359 PHNE_1706
PHNE_1360 PHNE_1707
PHNE_1361 PHNE_1708
All HP NIS clients and servers running ypbind should obtain and
install the patch appropriate for their machine's architecture
as described below.
-----------------------------------------------------------------------------
I. Description
A vulnerability in HP NIS allows unauthorized access to NIS data.
II. Impact
Root on a remote host running any vendor's implementation of NIS
can gain root access on any local host running HP's NIS ypbind.
Local users of a host running HP's NIS ypbind can also gain root access.
III. Solution
1) All HP NIS clients and servers running ypbind should obtain and
install the patch appropriate for their machine's architecture.
These patches contain a version of ypbind that accepts ypset
requests only from a superuser port on the local host. This prevents
a non-superuser program from sending rogue ypset requests to ypbind.
The patches also include the mod from the superseded patches that
prevents a superuser on a remote system from issuing a ypset -h
command to the local system and binding the system to a rogue ypserver.
These patches may be obtained from HP via FTP (this is NOT
anonymous FTP) or the HP SupportLine. To obtain HP security
patches, you must first register with the HP SupportLine.
The registration instructions are available via anonymous FTP at
cert.org (192.88.209.5) in the file
"pub/vendors/hp/supportline_and_patch_retrieval".
The new patch files are:
Architecture Patch ID Filename Checksum
------------ -------- -------- --------
Series 300 PHNE_1706 /hp-ux_patches/s300_400/8.X/PHNE_1706 38955 212
Series 700 PHNE_1707 /hp-ux_patches/s700/8.X/PHNE_1707 815 311
Series 800 PHNE_1708 /hp-ux_patches/s800/8.X/PHNE_1708 56971 299
2) The instructions for installing the patch are provided in the
PHNE_xxxx.text file (this file is created after the patch has
been unpacked).
The checksums listed above are for the patch archive files from HP.
Once unpacked, each shell archive contains additional checksum
information in the file "patchfilename.text". This checksum is
applicable to the binary patch file "patchfilename.updt".
If you have any questions about obtaining or installing the patches,
contact the USA HP SupportLine at 415-691-3888, or your local HP
SupportLine number. Please note that the telephone numbers in this
advisory are appropriate for the USA and Canada.
-----------------------------------------------------------------------------
The CERT Coordination Center wishes to thank Brian Kelley of Ford Motor
Company for bringing this vulnerability to our attention. We would also
like to thank Hewlett-Packard for their response to this problem.
-----------------------------------------------------------------------------
If you believe that your system has been compromised, contact the CERT
Coordination Center or your representative in FIRST (Forum of Incident
Response and Security Teams).
Internet E-mail: cert@cert.org
Telephone: 412-268-7090 (24-hour hotline)
CERT personnel answer 7:30 a.m.-6:00 p.m. EST(GMT-5)/EDT(GMT-4),
on call for emergencies during other hours.
CERT Coordination Center
Software Engineering Institute
Carnegie Mellon University
Pittsburgh, PA 15213-3890
Past advisories, information about FIRST representatives, and other
information related to computer security are available for anonymous FTP
from cert.org (192.88.209.5).
****************************************************************************
* *
* The point of contact for MILNET security-related incidents is the *
* Security Coordination Center (SCC). *
* *
* E-mail address: SCC@NIC.DDN.MIL *
* *
* Telephone: 1-(800)-365-3642 *
* *
* NIC Help Desk personnel are available from 7:00 a.m.-7:00 p.m. EST, *
* Monday through Friday except on federal holidays. *
* *
****************************************************************************